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	# Pleroma: A lightweight social networking server
	# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
	# SPDX-License-Identifier: AGPL-3.0-only

	defmodule Pleroma.Object do
	use Ecto.Schema

	alias Pleroma.Activity
	alias Pleroma.Object
	alias Pleroma.Object.Fetcher
	alias Pleroma.ObjectTombstone
	alias Pleroma.Repo
	alias Pleroma.User

	import Ecto.Query
	import Ecto.Changeset

	require Logger

	schema "objects" do
	field(:data, :map)

	timestamps()
	end

	def create(data) do
	Object.change(%Object{}, %{data: data})
	\|> Repo.insert()
	end

	def change(struct, params \\ %{}) do
	struct
	\|> cast(params, [:data])
	\|> validate_required([:data])
	\|> unique_constraint(:ap_id, name: :objects_unique_apid_index)
	end

	def get_by_id(nil), do: nil
	def get_by_id(id), do: Repo.get(Object, id)

	def get_by_ap_id(nil), do: nil

	def get_by_ap_id(ap_id) do
	Repo.one(from(object in Object, where: fragment("(?)->>'id' = ?", object.data, ^ap_id)))
	end

	defp warn_on_no_object_preloaded(ap_id) do
	"Object.normalize() called without preloaded object (#{ap_id}). Consider preloading the object"
	\|> Logger.debug()

	Logger.debug("Backtrace: #{inspect(Process.info(:erlang.self(), :current_stacktrace))}")
	end

	def normalize(_, fetch_remote \\ true, options \\ [])

	# If we pass an Activity to Object.normalize(), we can try to use the preloaded object.
	# Use this whenever possible, especially when walking graphs in an O(N) loop!
	def normalize(%Object{} = object, _, _), do: object
	def normalize(%Activity{object: %Object{} = object}, _, _), do: object

	# A hack for fake activities
	def normalize(%Activity{data: %{"object" => %{"fake" => true} = data}}, _, _) do
	%Object{id: "pleroma:fake_object_id", data: data}
	end

	# No preloaded object
	def normalize(%Activity{data: %{"object" => %{"id" => ap_id}}}, fetch_remote, _) do
	warn_on_no_object_preloaded(ap_id)
	normalize(ap_id, fetch_remote)
	end

	# No preloaded object
	def normalize(%Activity{data: %{"object" => ap_id}}, fetch_remote, _) do
	warn_on_no_object_preloaded(ap_id)
	normalize(ap_id, fetch_remote)
	end

	# Old way, try fetching the object through cache.
	def normalize(%{"id" => ap_id}, fetch_remote, _), do: normalize(ap_id, fetch_remote)
	def normalize(ap_id, false, _) when is_binary(ap_id), do: get_cached_by_ap_id(ap_id)

	def normalize(ap_id, true, options) when is_binary(ap_id) do
	Fetcher.fetch_object_from_id!(ap_id, options)
	end

	def normalize(_, _, _), do: nil

	# Owned objects can only be mutated by their owner
	def authorize_mutation(%Object{data: %{"actor" => actor}}, %User{ap_id: ap_id}),
	do: actor == ap_id

	# Legacy objects can be mutated by anybody
	def authorize_mutation(%Object{}, %User{}), do: true

	def get_cached_by_ap_id(ap_id) do
	key = "object:#{ap_id}"

	Cachex.fetch!(:object_cache, key, fn _ ->
	object = get_by_ap_id(ap_id)

	if object do
	{:commit, object}
	else
	{:ignore, object}
	end
	end)
	end

	def context_mapping(context) do
	Object.change(%Object{}, %{data: %{"id" => context}})
	end

	def make_tombstone(%Object{data: %{"id" => id, "type" => type}}, deleted \\ DateTime.utc_now()) do
	%ObjectTombstone{
	id: id,
	formerType: type,
	deleted: deleted
	}
	\|> Map.from_struct()
	end

	def swap_object_with_tombstone(object) do
	tombstone = make_tombstone(object)

	object
	\|> Object.change(%{data: tombstone})
	\|> Repo.update()
	end

	def delete(%Object{data: %{"id" => id}} = object) do
	with {:ok, _obj} = swap_object_with_tombstone(object),
	deleted_activity = Activity.delete_by_ap_id(id),
	{:ok, true} <- Cachex.del(:object_cache, "object:#{id}"),
	{:ok, _} <- Cachex.del(:web_resp_cache, URI.parse(id).path) do
	{:ok, object, deleted_activity}
	end
	end

	def prune(%Object{data: %{"id" => id}} = object) do
	with {:ok, object} <- Repo.delete(object),
	{:ok, true} <- Cachex.del(:object_cache, "object:#{id}"),
	{:ok, _} <- Cachex.del(:web_resp_cache, URI.parse(id).path) do
	{:ok, object}
	end
	end

	def set_cache(%Object{data: %{"id" => ap_id}} = object) do
	Cachex.put(:object_cache, "object:#{ap_id}", object)
	{:ok, object}
	end

	def update_and_set_cache(changeset) do
	with {:ok, object} <- Repo.update(changeset) do
	set_cache(object)
	end
	end

	def increase_replies_count(ap_id) do
	Object
	\|> where([o], fragment("?->>'id' = ?::text", o.data, ^to_string(ap_id)))
	\|> update([o],
	set: [
	data:
	fragment(
	"""
	jsonb_set(?, '{repliesCount}',
	(coalesce((?->>'repliesCount')::int, 0) + 1)::varchar::jsonb, true)
	""",
	o.data,
	o.data
	)
	]
	)
	\|> Repo.update_all([])
	\|> case do
	{1, [object]} -> set_cache(object)
	_ -> {:error, "Not found"}
	end
	end

	def decrease_replies_count(ap_id) do
	Object
	\|> where([o], fragment("?->>'id' = ?::text", o.data, ^to_string(ap_id)))
	\|> update([o],
	set: [
	data:
	fragment(
	"""
	jsonb_set(?, '{repliesCount}',
	(greatest(0, (?->>'repliesCount')::int - 1))::varchar::jsonb, true)
	""",
	o.data,
	o.data
	)
	]
	)
	\|> Repo.update_all([])
	\|> case do
	{1, [object]} -> set_cache(object)
	_ -> {:error, "Not found"}
	end
	end

	def increase_vote_count(ap_id, name) do
	with %Object{} = object <- Object.normalize(ap_id),
	"Question" <- object.data["type"] do
	multiple = Map.has_key?(object.data, "anyOf")

	options =
	(object.data["anyOf"] \|\| object.data["oneOf"] \|\| [])
	\|> Enum.map(fn
	%{"name" => ^name} = option ->
	Kernel.update_in(option["replies"]["totalItems"], &(&1 + 1))

	option ->
	option
	end)

	data =
	if multiple do
	Map.put(object.data, "anyOf", options)
	else
	Map.put(object.data, "oneOf", options)
	end

	object
	\|> Object.change(%{data: data})
	\|> update_and_set_cache()
	else
	_ -> :noop
	end
	end
	end

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